Method for Determining Frequency Domain Location of Control Resource Set and Related Device

1. A method, comprising: receiving, by an apparatus, configuration information of a first common control resource set before successful initial access of the apparatus, wherein the configuration information indicates where a physical resource block occupied by the first common control resource set is located in a first downlink bandwidth part, and wherein the first downlink bandwidth part is configured by system information block 1 (SIB1) and takes effect after the successful initial access of the apparatus; and monitoring, by the apparatus, a physical downlink control channel in the first common control resource set before the successful initial access of the apparatus, to obtain uplink scheduling control information or downlink scheduling control information, wherein a start common resource block of the first common control resource set is determined based on a start common resource block of the first downlink bandwidth part and the configuration information of the first common control resource set.

2. The method according to claim 1, wherein the first downlink bandwidth part is different from an initial downlink bandwidth part defined by control resource set 0 (CORESET #0).

3. The method according to claim 2, wherein the initial downlink bandwidth part defined by CORESET #0 takes effect before successful initial access of a terminal device.

4. The method according to claim 3, wherein the successful initial access of the apparatus indicates one of the following occasions: an occasion on which the apparatus successfully receives an initially transmitted message 4 and sends an acknowledgement message to a network device; an occasion on which the apparatus successfully receives, after the apparatus successfully receives an initially transmitted message 4, downlink control information (DCI) scrambled by a cell radio network temporary identifier (C-RNTI); an occasion on which the apparatus successfully receives a retransmitted message 4 and sends an acknowledgement message to a network device; an occasion on which the apparatus successfully receives, after the apparatus successfully receives a retransmitted message 4, DCI scrambled by a C-RNTI; an occasion on which the apparatus successfully receives, after successfully receiving an initially transmitted message 4, configuration information indicating that DCI scrambled by a C-RNTI needs to be blindly detected; an occasion on which the apparatus successfully receives, after successfully receiving a retransmitted message 4, configuration information indicating that DCI scrambled by a C-RNTI needs to be blindly detected; or an occasion on which the apparatus switches from the initial downlink bandwidth part defined by using CORESET #0 to the first downlink bandwidth part configured by the SIB1 after successfully receiving an initially transmitted message 4 or a retransmitted message 4.

5. The method according to claim 1, further comprising: monitoring, by the apparatus, a physical downlink control channel in the first common control resource set after the successful initial access of the apparatus, to obtain uplink scheduling control information or downlink scheduling control information.

6. The method according to claim 1, wherein an identifier of the first common control resource set is not 0.

7. The method according to claim 1, wherein the uplink scheduling control information or downlink scheduling control information may be control information for scheduling a random access response, control information for scheduling a paging message, or control information for scheduling a system message.

8. An apparatus, comprising: one or more processors configured to: receive configuration information of a first common control resource set before successful initial access of the apparatus, wherein the configuration information indicates where a physical resource block occupied by the first common control resource set is located in a first downlink bandwidth part, and wherein the first downlink bandwidth part is configured by system information block 1 (SIB1) and takes effect after the successful initial access of the apparatus; and monitor a physical downlink control channel in the first common control resource set before the successful initial access of the apparatus, to obtain uplink scheduling control information or downlink scheduling control information, wherein a start common resource block of the first common control resource set is determined based on a start common resource block of the first downlink bandwidth part and the configuration information of the first common control resource set.

9. The apparatus according to claim 8, wherein the first downlink bandwidth part is different from an initial downlink bandwidth part defined by control resource set 0 (CORESET #0).

10. The apparatus according to claim 9, wherein the initial downlink bandwidth part defined by CORESET #0 takes effect before successful initial access of the apparatus.

11. The apparatus according to claim 8, wherein the successful initial access of the apparatus indicates one of the following occasions: an occasion on which the apparatus successfully receives an initially transmitted message 4 and sends an acknowledgement message to a network device; an occasion on which the apparatus successfully receives, after the apparatus successfully receives an initially transmitted message 4, downlink control information (DCI) scrambled by a cell radio network temporary identifier (C-RNTI); an occasion on which the apparatus successfully receives a retransmitted message 4 and sends an acknowledgement message to a network device; an occasion on which the apparatus successfully receives, after the apparatus successfully receives a retransmitted message 4, DCI scrambled by a C-RNTI; an occasion on which the apparatus successfully receives, after successfully receiving an initially transmitted message 4, configuration information indicating that DCI scrambled by a C-RNTI needs to be blindly detected; an occasion on which the apparatus successfully receives, after successfully receiving a retransmitted message 4, configuration information indicating that DCI scrambled by a C-RNTI needs to be blindly detected; or an occasion on which the apparatus switches from an initial downlink bandwidth part defined by using CORESET #0 to the first downlink bandwidth part configured by the SIB1 after successfully receiving an initially transmitted message 4 or a retransmitted message 4.

12. The apparatus according to claim 8, wherein the one or more processors further configured to: monitor a physical downlink control channel in the first common control resource set after the successful initial access of the apparatus, to obtain uplink scheduling control information or downlink scheduling control information.

13. The apparatus according to claim 8, wherein the uplink scheduling control information or downlink scheduling control information may be control information for scheduling a random access response, control information for scheduling a paging message, or control information for scheduling a system message.

14. A method, comprising: sending, by an apparatus, configuration information of a first common control resource set before successful initial access of a terminal device, wherein the configuration information indicates where a physical resource block occupied by the first common control resource set is located in a first downlink bandwidth part, and wherein the first downlink bandwidth part is configured by system information block 1 (SIB1) and takes effect after the successful initial access of the terminal device; and sending, by the apparatus, uplink scheduling control information or downlink scheduling control information on a physical downlink control channel in the first common control resource set before the successful initial access of the terminal device.

15. The method according to claim 14, wherein the first downlink bandwidth part is different from an initial downlink bandwidth part defined by control resource set 0 (CORESET #0).

16. The method according to claim 15, wherein the initial downlink bandwidth part defined by CORESET #0 takes effect before successful initial access of the terminal device.

17. The method according to claim 14, wherein a start common resource block of the first common control resource set is determined based on a start common resource block of the first downlink bandwidth part and the configuration information of the first common control resource set.

18. The method according to claim 14, wherein the successful initial access of the terminal device is used to indicate one of the following occasions: an occasion on which the apparatus receives an acknowledgement message that is sent by the terminal device and that is for an initially transmitted message 4 sent by the apparatus; an occasion on which the apparatus receives an acknowledgement message that is sent by the terminal device and that is for a retransmitted message 4 sent by the apparatus; an occasion on which the apparatus sends, to the terminal device after receiving an acknowledgement message that is sent by the terminal device and that is for an initially transmitted message 4 sent by the apparatus, configuration information used to indicate that DCI scrambled by using a C-RNTI needs to be blindly detected; an occasion on which the apparatus sends, to the terminal device after receiving an acknowledgement message that is sent by the terminal device and that is for a retransmitted message 4 sent by the apparatus, configuration information used to indicate that DCI scrambled by using a C-RNTI needs to be blindly detected; or an occasion on which the terminal device switches from an initial downlink bandwidth part defined by using CORESET #0 to the first downlink bandwidth part configured by the SIB1 after successfully receiving an initially transmitted message 4 or a retransmitted message 4.

19. The method according to claim 14, further comprising: sending, by the apparatus, uplink scheduling control information or downlink scheduling control information on a physical downlink control channel in the first common control resource set after the successful initial access of the terminal device.

20. The method according to claim 14, wherein the uplink scheduling control information or downlink scheduling control information may be control information for scheduling a random access response, control information for scheduling a paging message, or control information for scheduling a system message.